Wash and scrub the potatoes removing any blemishes. Cook the potatoes whole in salted water for 15 minutes or until fork tender.
To the pot add the peas. Continue to cook for 2-3 minutes or just until the peas are thawed and heated through.
Drain the potatoes and peas. Use a sharp knife to cut the potatoes into 1-inch cubes.
Make the White Sauce: Meanwhile, in a large 12 inch skillet or heavy bottomed pot, melt the butter.
Once melted add the diced onion. Cook over medium-high heat just until translucent and softened, about 2 minutes.
Add the flour to the onions. Stir until the flour is absorbed. Add the salt, black pepper, granulated garlic, onion powder, thyme and nutmeg. Mix to combine.
Whisk in chicken stock and milk. Bring to a gentle boil then immediately lower the heat and simmer for 5 minutes on low, then keep warm until the potatoes are done.
Combine: Add the potatoes and peas to the sauce. Gently stir to fully coat with sauce. Simmer for 1-2 minutes.
Remove from the heat and serve immediately garnished with snipped chives.
Notes
You can use bacon drippings in place of butter.
You can use fresh peas in place of frozen. Fresh peas may take a few minutes longer to cook.